![]() Additionally, the slashed zero is used in many ASCII graphic sets descended from the default typewheel on the Teletype Model 33. It is used in many Baudot teleprinter applications, specifically the keytop and typepallet that combines "P" and slashed zero. In the days of the typewriter, typists would generate slashed zero by typing a normal "O" or zero, backspacing, and then hitting the slash key to mark on top of the zero. The slashed zero predates computers, and is known to have been used in the twelfth and thirteenth centuries. Slashed zeros are used on New Zealand number plates. Slashed zeroes can also be used on cheques in order to prevent fraud, for example: Changing a 0 to an 8. It also denotes an absence of something (similar to the usage of an ' empty set' character), such as a sign or a symptom. The slashed zero is also used in charting and documenting in the medical and healthcare fields to avoid confusion with the letter 'O'. The slashed zero can be used in stoichiometry to avoid confusion with the symbol for oxygen (capital O). The slashed zero, sometimes called communications zero, was used on teleprinter circuits for weather applications. ![]() It is used by computer programmers, in recording amateur radio call signs and in military radio, as logs of such contacts tend to contain both letters and numerals. ![]() The slashed zero is used in a number of fields in order to avoid confusion with the letter 'O'. Slashed zeroes on a bus stop sign in Portugal, 2020.
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